Q:
# What is the difference between vertical and horizontal lines?

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### Quick Answer

Horizontal lines are parallel to the horizon or parallel to level ground. They have a slope of zero and are parallel to the x-axis on a graph. Vertical lines are perpendicular to the horizon, parallel to the y-axis on a graph and have undefined slope.

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The term "horizontal" derives from the Latin "horizontem" which means "flat." The term "vertical" derives from the Latin "vertex," which means "highest point."

The slope of a line refers to the change in the rise, or y-value, divided by the run, or the change in x-value. Because a horizontal line does not change in y-value with changes in x-value, its slope may be calculated as zero divided by any number. This results in a slope of zero. For vertical lines, the slope equation leads to a division by zero, which is undefined.

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Q:
## What are some examples of irregular solids?

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Full Answer >**Examples of irregular solids include rocks, prisms, beans and screws.**Each of these objects feature an irregular shape that is not composed of other recognized shapes.Filed Under: -
Q:
## What is a nine-sided polygon?

A:A nine-sided polygon is commonly called a nonagon. This polygon, which has nine edges, or vertices, is also called an enneagon. The term enneagon is preferable, but less popular than the name nonagon because the latter is simpler to spell and pronounce, according to Wolfram MathWorld.

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Q:
## How many diagonals does a dodecagon have?

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Full Answer >**A dodecagon, a polygon with 12 sides and 12 vertices, has 54 distinct diagonals.**The formula for determining the number of diagonals of an n-sided polygon is n(n - 3)/2; thus, a dodecagon has 12(12 - 3)/2 = 12(9)/2 = 108/2 = 54 diagonals.Filed Under: -
Q:
## What is a perpendicular bisector?

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Full Answer >**A perpendicular bisector is a line that cuts across the midpoint of a given line segment at a 90-degree angle.**It divides the line segment into two equal parts. A common method for drawing perpendicular bisectors uses a compass and straight edge or ruler.Filed Under: